Actually, I just think Swihart is over-rated. Last year I was very pro-Swihart because of his age and inexperience, so I was stunned that, with all that 2015 experience plus spring training, plus apparently being handed the starting catcher job, the Sox manager and FO apparently decided very quickly Swihart was a detriment behind the plate. So much so they sent him to Pawtucket and told him to acquire outfield skills. Once you convert to LF, my opinion, then you need to be a pretty good hitter, and I'm not so sure Swihart is.
All the Swihart fans, of which there are many, I'm sure, need to acknowledge that he probably isn't that great young catching prospect we all thought he was. I think it's true that he became a catcher after he entered the Sox farm system. Before that he was an infielder/outfielder, which means the catching thing was an experiment, which the FO appears to have decided to abandon.
When Holt was hurt, I thought giving Swihart a shot was a good idea, better than Castillo. But right now I'm thinking Swihart on the DL ain't a big loss because the Sox have other decent options for LF-- Young, Castillo, and Holt. Swihart won't be missed.